How do I protect my LED from high voltage?
A surge protection subassembly that can suppress excessive surges to lower voltage levels is an optimal way to protect the LED luminaire investment. Metal Oxide Varistor (MOV) technology is not only inexpensive but also a highly effective technology for suppressing transients in power supplies.
How to protect LED?
Fortunately, this problem can be avoided by placing an open-LED protection device in parallel with each LED on the string. An open LED protector is an electronic shunt which provides a current bypass in the case of an open circuit, thus saving the LED string from partial or complete failure.
Is LED a voltage regulator?
An active constant current regulator is commonly used for high power LEDs, stabilizing light output over a wide range of input voltages which might increase the useful life of batteries. Low drop-out (LDO) constant current regulators also allow the total LED voltage to be a higher fraction of the power supply voltage.
Which is better for Q point stability diode or Zener?
Noise could be a factor if large e-cap is insufficient but lower Rs or ESR gives better Q point stability. ESR is the variable that affects any diode or Zener Vf vs If and is always = 1/Pd which depends on size of chip. Whereas small zeners are ~ 20 Ohms in low voltage range.
When does a Zener diode make a noise?
Remember that low voltage Zeners have bad knee characteristics and poor tolerances. Zener diodes do make noise when in the breakdown region. In fact, there are noise generators based on this known principle in antique ARRL handbooks.
Can a led be used as a voltage reference?
LEDs can be, have been and are used as voltage references. Standard LEDs in various colors are cheap and hence sensible when wanting a low accuracy low voltage reference. Remember that low voltage Zeners have bad knee characteristics and poor tolerances.